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Question: Questions on Beosound 8

Questions on Beosound 8
1. How to connect Apple Airport Express to Beosound8? Can Airport Express deliver sound via its usb output directly to Beosound8 usb (to tap on Beosound8 DAC)?
2. Can Beosound8 be fully connected in the rear with usb and RCA and with an ipod in the dock and it intelligently plays back from the active sound source? or must all connections be unplug from Beosound8 leaving behind only 1 source plug in at a time?